Dressing device for grinding discs, especially for use in connection with the grinding of spectacle glasses



Sept. 4, 1962 A. ENDERS EIAL 3,

DRESSING DEVICE FOR GRINDING DISCS, ESPECIALLY FOR USE IN CONNECTION WITH THE GRINDING OF SPECTACLE GLASSES Filed Feb. 4, 1959 3,052,227 DRESSING DEVICE FOR GRINDING DISCS, ES-

PECIALLY FOR USE IN CONNECTION WITH THE GRINDING F SPECTACLE GLASSES Adolf Enders, Lubeclr, Alfred K. Seirig, Dusseldorf, and Hans Joachim Struncir, Koln, Germany, assignors t0 Wernicke 8.; Co., KG, Dusseldorf-Ellen, Germany Filed Feb. 4, 1959, Ser. No. 791,091 Claims priority, application Germany Feb. 6, 1958 Claims. (@Cl. 12511) The present invention relates to an apparatus for dressing and profiling the surface of grinding discs as they are employed in particular in cham-fer grinding machines for spectacle glasses. Such grinding discs, which consist primarily of ceramically bonded grinding means, are subjected to a considerable wear so that such grinding discs have to be dressed or trued relatively frequently in order to obtain a proper ground chamfer.

With most of the heretofore known dressing and profiling devices of the type involved, an adjusting device of the dressing tool is necessary for the transverse movement of the latter, and a further adjusting device for the depth is required in order to obtain the chamfer groove which is triangular in cross section. Therefore, two manual operations are required with the heretofore known dressing devices of the type involved.

It is, therefore, an object of the present invention to provide a dressing or profiling device for grinding discs, especially for use in connection with the grinding of spectacle glasses, which will be considerably simplified in operation over the heretofore known dressing devices of the type involved.

It is another object of this invention to provide a dressing device by means of which the dressing or profiling of the grinding disc can be effected by rotation of a single spindle.

These and other objects and advantages of the invention will appear more clearly from the following specification in connection with the accompanying drawings, in which:

FIG. 1 is a longitudinal section through a device according to the present invention, said section being taken along the line II of FIG. 2.

FIG. 2 is a transverse section through FIG. 1 taken along the line I III thereof.

FIG. 3 is a horizontal section taken along the line IIIIH of FIG. 1.

General Arrangement The dressing or profiling device according to the present invention by means of which the dressing or profiling of the grinding disc may be effected by turning of a single spindle, is characterized primarily in that that portion which carries the dressing tool is movable in transverse direction by a spindle nut and is resiliently held against a copying bar templet by means of springs connected thereto. Preferably, the spindle actuating the spindle nut is journalled in a housing the lid of which is movable in axial direction of the spindle as well as transverse thereto and receives the dressing tool.

With a practical embodiment of the invention, the spindle nut is guided on the copying bar and is provided with a forked portion engaged by a tongue connected to the lid.

The springs of the device according to the invention bring about that, on one hand, the lid will be resiliently held against the edge portion of the housing and that, the other hand, pivots or studs connected to the lid will during the adjustment of the lid and thereby of the dressing tool slide along the copying bar.

The tightening and clamping of the device is effected 3,052,227 Patented Sept. 4, 1962 by a second spindle arranged coaxially with the first mentioned spindle and by means of a corresponding spindle nut cooperating with said second spindle. The first spindle, which is adapted to adjust the lid, has one of its ends journalled in the second spindle nut which latter brings about the tightening or clamping of the device.

Structural Arrangement Referring now to the drawing in detail, the apparatus shown therein comprises a housing 1 having a front and rear wall portion 2 extending downwardly. One end edge 3 of said wall portions rests against a guiding bar 4 of a support A for the dressing device according to the invention, said support A forming part of a standard chamfer grinding machine as used for spectacle grinding and receives the dressing device for truing or dressing the grinding wheel of said chamfer grinding machine when the dressing apparatus is properly mounted and connected to its support. The apparatus according to the present invention furthermore comprises a spindle 5 adapted to be rotated by means of a cross bar 6 and threadedly engaging a spindle nut 7. By turning spindle 5, nut 7 is adjusted in such a way that the latter will abut a sec-0nd guiding bar 8 of the said support A whereby the dressing device according to the invention is firmly secured to the support A.

Spindle 5 has journalled therein one end of a second spindle 9 the other end of which is journalled in the housing portion 1a and connected to a handle 10 so as to be rotatable thereby. Spindle 9 threadedly engages a spindle nut 11 provided with extensions 12 and 13. The extensions 12 and 13 have respectively connected thereto one end of springs 14 and 15 the other ends of which are connected to a lid 18 which latter is slidable in longitudinal and transverse direction on the housing surfaces 1b, 1c, 1d, 1e. Spindle nut 11 has a fork-shaped portion 17 with a cutout 16 which latter is engaged by a tongue 19 connected to lid 18. The lid portion adjacent tongue 19 carries -a dressing tool 21 which is adjustable by a setting screw 20 (FIG. 2). By means of springs '14 and 15, lid 18 is resiliently held against the surfaces \1b, 1c, 1d, 1e of housing '1. At the same time, springs 14 and 15 hold studs 22 and 23, which are connected to lid 18, in engagement with a copying templet bar 24 which is provided with notches or cutouts 25 in conformity with the chamfer groove of the grinding wheel to be dressed. The copy bar 24 simultaneously serves as guide for spindle nut 11 which has a bore 26 through which extends the copying or templet bar 24. The template bar 24 may, of course, also have a shape different from that shown in the drawing.

When spindle 9 is rotated, spindle nut 11 is adjusted along said spindle and during this displacement through the intervention of the fork-shaped portion 17 moves tongue 19 and thereby lid 18 which is slidable on the housing edge, in the direction of movement of said spindle nut 11. At the same time, the stud 22, 23 connected to the lid 18 slide along the copying bar 24 while said studs, due to springs 14 and 15 connected to said lid, are held in engagement with the copying bar 24.

It is, of course, to be understood that the present invention is, by no means, limited to the particular construction shown in the drawing but also comprises any modifications within the scope of the appended claims.

What we claim is:

1. in an apparatus for dressing the surfaces of grinding discs, especially for use in connection with chamfer grinding machines for spectacle glasses: a housing, spindle means rotatably journalled in said housing, nut means in threaded engagement with said spindle means for movement thereon in longitudinal direction of said spindle means, said nut means being provided with slot means having its longitudinal direction transverse to the longitudinal direction of said spindle means, supporting means resting on said housing for supporting a dressing tool, said supporting means having an extension slidably engaging said slot means so as to cause said supporting means to move in longitudinal direction of said spindle means by movement of said nut means While simultaneously permitting said supporting means to move transverse to the longitudinal direction of said spindle means, said supporting means being movable on said housing in longitudinal direction of said spindle means and transverse thereto, templet means supported by said housing, feeler means firmly connected to said supporting means, and spring means continuously yieldably pressing said feeler means against said templet means.

2. An apparatus according to claim 1, in which said nut means is guided on said templet means.

3. In an apparatus for dressing the surfaces of grinding discs, especially for use in connection with chamfer grinding machines for spectable glasses: a housing, spindle means rotatably journalled in said housing, nut means in threaded engagement With said spindle means for movement thereon in longitudinal direction of said spindle means, said nut means being provided with slot means having its longitudinal direction transverse to the longitudinal direction of said spindle means, supporting means resting on said housing for supporting a dressing tool, said supporting means having an extension slidably engaging said slot means so as to cause said supporting means to move in longitudinal direction of said spindle means by movement of said nut means While simultaneously permitting said supporting means to move transverse to the longitudinal direction of said spindle means, said supporting means being movable on said housing in longitudinal direction of said spindle means and transverse thereto, templet means stationarily supported by said housing and in guiding engagement with said nut means for guiding the latter, stud means rig-idly connected to said supporting means, and spring means continuously yieldably pressing said stud means against said templet means.

4. In an apparatus for dressing the surfaces of grinding discs, especially for use in connection with chamfer grinding machines for spectacle glasses: a housing, spindle means rotatably journalled in said housing, nut means in threaded engagement with said spindle means for movement thereon in longitudinal direction of said spindle means, supporting means resting on said housing for supporting a dressing tool, said supporting means being slidable on said housing as a single unit both in longitudinal direction of said spindle means and transverse thereto and also simultaneously in longitudinal direction of said spindle means and at an angle thereto, said supporting means engaging said nut means so as to be movable 5 thereby in longitudinal direction of said spindle means,

templet means supported by said housing and extending through said nut means so as to guide the same, feeler means connected to said supporting means, and spring means yieldably pressing said feeler means against said templet means and yieldably connecting said supporting means to said nut means.

5. In an apparatus for dressing the surfaces of grinding discs, especially for use in connection with chamfer grinding machines for spectacle glasses: a housing, a first spindle having one end rotatably journalled in said housing, a second spindle arranged in substantially axial alignment with said first spindle and having one end provided with means journalled in said housing and having its other end designed as a bearing for journalling the other end of said first spindle, first manually operable means connected to said first spindle for rotating the same independently of said second spindle, second manually operable means connected to said second spindle for rotating the latter independently of said first spindle, first nut means in threaded engagement With said first spindle for movement thereon in longitudinal direction of said first spindle, supporting means resting on said housing for supporting a dressing tool, said supporting means being slidable on said housing in longitudinal di rection of said first spindle and transverse thereto and engaging said first nut means so as to be movable thereby in longitudinal direction of said first spindle, templet means supported by said housing, feeler means firmly connected to said supporting means, spring means yieldably pressing said feeler means against said templet means and yieldably connecting said supporting means to said first nut means, and second nut means threadedly engaging said second spindle and movable thereon in longitudinal direction of said second spindle for selectively clamping said housing to a support for said apparatus.

References Cited in the file of this patent UNITED STATES PATENTS 845,410 Grieshaber Feb. 26, 1907 1,416,462 Hanson May 16, 1922 1,580,343 Steiner Apr. 13, 1926 1,592,076 Bugbee July 13, 1926 2,258,568 Flygare Oct. 7, 1941 2,611,356 Flygare et al. Sept. 23, 1952 FOREIGN PATENTS 18,051 Great Britain Aug. 5, 1909 OTHER REFERENCES Fixture Dresses, Etc. by Whittles from American Machinist, May 18, 1938; page 428. :(Copy in Scientific Library.)

Wheel Forming, Etc. from Grits and Grinds, July 1945, volume 36, No. 7; pages 10 and 11. (Copy in Scientific Library.) 

